boost gauge

Basically I put in an autometer 30/30 mechanical gauge today and it reads a max of 10psi but my stock gauge read closer to 15-17. I have it hooked up to the stock lines and it reads vac correctly and seats at 0 but only goes up to 10. This is the second gauge that I've tried so I know its not the gauge. Any ideas whats going on? Should I just run a new line out to the motor?

Wait, so you have tried other gauges and it still only reads 10psi tops? I wouldn't trust the stocker when it comes down to it...How is the car pulling? Does it "feel" like only 10lbs? You must have a decent sized boost leak somewhere.

Well the first guage acted weird like it never went to 0 when the car was off but I messed around with the vac line on the back of the gauge and it seemed to change. The car pulls decent, but I have a hard time believing the stock gauge is off that far. On DAB setting 0 on the stock gague was 7psi and its still 7psi on this gauge but like I said it seems like the needle gets stuck at 10psi. I'm thinking it might have something to do with the vac line and maybe I should run an all new one

If the gauge reads anything besides "0" at any point in time then somethings up.

well this gauge seems to be fine except for the fact its reading low boost. I'm thinking that its a problem in the line but its weird that the gauges read 7-10psi different

If I remember correctly you can bypass the factory lines and "T" into the line comming off of the tb.

Do you just plug the line or where can you block it off

Do you just plug the line or where can you block it off


oh ya that's right, you are still using the stock vacuum lines right?

as far as the boost gauge yes but not under the hood

I'm referring to your under hood lines. Have you bypassed the solenoids?

yes, all but one